i felt bad so i bought a 2.5 gallon today and its allf filtered and ready. just have only one heater and its a 7.5 watt and its in the 1 gallon and has heated thhe one gallon to exactly 82ish as of now.

i need this heater for my 2.5 gallon tank, when should i take it out of 1 gallon?

Yes, I would definitely turn off the light at night. Bettas need time to sleep just like we do.

By the way, I have the 7.5 watt heater like that one. Please keep a close watch on it, it has shot my tank's temperature up a couple of times if it was left plugged in for too long. I, too, have a 2.5 gallon minibow. If you are prepared to closely monitor it, though, you should be fine.

Yes, I would definitely turn off the light at night. Bettas need time to sleep just like we do.

By the way, I have the 7.5 watt heater like that one. Please keep a close watch on it, it has shot my tank's temperature up a couple of times if it was left plugged in for too long. I, too, have a 2.5 gallon minibow. If you are prepared to closely monitor it, though, you should be fine.

I like to keep my tanks around 80 degrees. Much higher than that and I notice Drago hiding on the bottom of his tank, so 80 seems to be the sweet spot for him. At night, I unplug the little heater, and his tank sometimes gets down to 75, but no lower than that. I have a new one coming in the mail for him soon, and I am looking forward to taking the 7.5 watt out of his tank.